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  Created by IntelliJ IDEA.
  User: dailyblue
  Date: 2023/4/2
  Time: 11:09
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<%@ page contentType="text/html;charset=UTF-8" isELIgnored="false" language="java" %>
<html>
<head>
    <title>常量和表达式</title>
</head>
<body>
${3} 3 <br/>
${4+3}..${4/3}<br/>
${4>3}<br/>
${true&&false}<br/>
${4>5?1:2}<br/>
<%--为空判断--%>
A是否为空：${empty A}<br/>
A是否不为空：${not empty A}
</body>
</html>
